There is a lot of content you can complete at level 50, alot of that content nets XP. I keep intending to switch to a class I don't intend to level faithfully upon completion, but keep finding myself in a hurry to see the dialog. Don't be a dumb *** like me, switch before turning in quests. I've lost over 15K xp today alone.
On a side note, unless I missed a patch info along the way, DoL(maybe DoH as well) get X less xp for certain quests as well. For example the main story line said something like 45K and I got 4.5K (I forget the exact number but multiple quests I've turned in when not a DoW seemed to net one 0 less than the quest aid was a reward.